Have you shot the film yet? If not thought I'd share a little bit of my own experience on expired Kodachrome movie film. If I were to shoot that film today in 2014 I would shoot at around 3.5 to 4 f-stops above normal, say in f-16 sun lighting I would shoot at around between f-4 and f-5.6. I've shot Kodachrome 25 that expired in 1980 and it made great pictures. As for the developing side of things, as I know the Kodachrome don't exist no more but the film can be cross processed as a B&W negative, I process all my Kodachromes in Caffenol C, the Kodachrome 25 I would process for 6 minutes in Caffenol C-M at 20 deg C.